Add os/hal/platforms/LPC8xx/spi_lld
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5534 35acf78f-673a-0410-8e92-d51de3d6d3f4master
theShed
parent
93baafe2e6
commit
0424e11412
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@ -3,6 +3,7 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/platforms/LPC8xx/hal_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/gpt_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/pal_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/serial_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/spi_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/ext_lld.c \
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${CHIBIOS}/os/hal/platforms/LPC8xx/ext_lld_isr.c
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@ -0,0 +1,385 @@
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC8xx/spi_lld.c
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* @brief LPC8xx low level SPI driver code.
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*
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* @addtogroup SPI
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_SPI || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
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/** @brief SPI1 driver identifier.*/
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SPIDriver SPID1;
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#endif
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#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
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/** @brief SPI2 driver identifier.*/
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SPIDriver SPID2;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static void spi_load_txdata(SPIDriver *spip) {
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LPC_SPI_TypeDef *spi = spip->spi;
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if (--spip->txcnt == 0) {
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spi->TXCTRL |= SPI_TXCTRL_EOT;
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}
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if (spip->txptr != NULL) {
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if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
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const uint16_t *p = spip->txptr;
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spi->TXDAT = *p++;
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spip->txptr = p;
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}
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else {
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const uint8_t *p = spip->txptr;
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spi->TXDAT = *p++;
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spip->txptr = p;
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}
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}
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else
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spi->TXDAT = 0xffff;
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}
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/**
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* @brief Common IRQ handler.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*/
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static void spi_serve_interrupt(SPIDriver *spip) {
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LPC_SPI_TypeDef *spi = spip->spi;
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if (spi->INTSTAT & (SPI_STAT_RXOV | SPI_STAT_TXUR)) {
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/* The overflow condition should never happen becausepriority is given
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to receive but a hook macro is provided anyway...*/
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LPC8xx_SPI_ERROR_HOOK(spip);
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spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
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}
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if (spi->INTSTAT & SPI_STAT_TXRDY) {
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spi_load_txdata( spip );
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}
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if (spip->txcnt == 0) {
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spi->INTENCLR = (SPI_STAT_TXRDY | SPI_STAT_TXUR);
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}
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if (spi->INTSTAT & SPI_STAT_RXRDY) {
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if (spip->rxptr != NULL) {
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if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
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uint16_t *p = spip->rxptr;
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*p++ = spi->RXDAT;
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spip->rxptr = p;
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}
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else {
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uint8_t *p = spip->rxptr;
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*p++ = spi->RXDAT;
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spip->rxptr = p;
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}
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}
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else
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(void)spi->RXDAT;
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if (--spip->rxcnt == 0) {
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chDbgAssert(spip->txcnt == 0,
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"spi_serve_interrupt(), #1", "counter out of synch");
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/* Stops the IRQ sources.*/
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spi->INTENCLR = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
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SPI_STAT_RXOV | SPI_STAT_TXUR);
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/* Portable SPI ISR code defined in the high level driver, note, it is
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a macro.*/
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_spi_isr_code(spip);
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return;
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}
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}
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
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/**
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* @brief SPI0 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector40) {
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CH_IRQ_PROLOGUE();
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spi_serve_interrupt(&SPID1);
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CH_IRQ_EPILOGUE();
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
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/**
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* @brief SPI1 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector44) {
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CH_IRQ_PROLOGUE();
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spi_serve_interrupt(&SPID2);
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CH_IRQ_EPILOGUE();
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}
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#endif
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level SPI driver initialization.
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*
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* @notapi
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*/
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void spi_lld_init(void) {
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#if LPC8xx_SPI_USE_SPI0
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spiObjectInit(&SPID1);
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SPID1.spi = LPC_SPI0;
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#endif
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#if LPC8xx_SPI_USE_SPI1
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spiObjectInit(&SPID2);
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SPID2.spi = LPC_SPI1;
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#endif
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}
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/**
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* @brief Configures and activates the SPI peripheral.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_start(SPIDriver *spip) {
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if (spip->state == SPI_STOP) {
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#if LPC8xx_SPI_USE_SPI0
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if (&SPID1 == spip) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<11);
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LPC_SYSCON->PRESETCTRL |= (1<<0);
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spip->spi->DIV = LPC8xx_SPI_SPI0CLKDIV;
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nvicEnableVector(SPI0_IRQn,
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CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI0_IRQ_PRIORITY));
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1
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if (&SPID2 == spip) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
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LPC_SYSCON->PRESETCTRL |= (1<<1);
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spip->spi->DIV = LPC8xx_SPI_SPI1CLKDIV;
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nvicEnableVector(SPI1_IRQn,
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CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI1_IRQ_PRIORITY));
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}
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#endif
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}
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spip->spi->DLY = spip->config->dly;
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spip->spi->TXCTRL = spip->config->txctrl;
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spip->spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
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spip->spi->CFG = spip->config->cfg | SPI_CFG_ENABLE;
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}
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/**
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* @brief Deactivates the SPI peripheral.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_stop(SPIDriver *spip) {
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if (spip->state != SPI_STOP) {
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spip->spi->CFG = 0;
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#if LPC8xx_SPI_USE_SPI0
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if (&SPID1 == spip) {
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nvicDisableVector(SPI0_IRQn);
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LPC_SYSCON->PRESETCTRL &= ~(1<<0);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<11);
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1
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if (&SPID2 == spip) {
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nvicDisableVector(SPI1_IRQn);
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LPC_SYSCON->PRESETCTRL &= ~(1<<1);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
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}
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#endif
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}
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}
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/**
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* @brief Asserts the slave select signal and prepares for transfers.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_select(SPIDriver *spip) {
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/* Hardware controls SSEL */
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(void)spip;
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}
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/**
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* @brief Deasserts the slave select signal.
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* @details The previously selected peripheral is unselected.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_unselect(SPIDriver *spip) {
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/* Hardware controls SSEL */
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(void)spip;
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}
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/**
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* @brief Exchanges data on the SPI bus.
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* @details This asynchronous function starts a simultaneous transmit/receive
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* operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to be exchanged
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* @param[in] txbuf the pointer to the transmit buffer
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* @param[out] rxbuf the pointer to the receive buffer
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*
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* @notapi
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*/
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void spi_lld_exchange(SPIDriver *spip, size_t n,
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const void *txbuf, void *rxbuf) {
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spip->rxptr = rxbuf;
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spip->txptr = txbuf;
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spip->rxcnt = spip->txcnt = n;
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spip->spi->TXCTRL &= ~SPI_TXCTRL_EOT;
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spi_load_txdata(spip);
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if (spip->txcnt == 0)
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spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_RXOV);
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else
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spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
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SPI_STAT_RXOV | SPI_STAT_TXUR);
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}
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/**
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* @brief Ignores data on the SPI bus.
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* @details This function transmits a series of idle words on the SPI bus and
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* ignores the received data. This function can be invoked even
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* when a slave select signal has not been yet asserted.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to be ignored
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*
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* @notapi
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*/
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void spi_lld_ignore(SPIDriver *spip, size_t n) {
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spi_lld_exchange( spip, n, NULL, NULL);
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}
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/**
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* @brief Sends data over the SPI bus.
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* @details This asynchronous function starts a transmit operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to send
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* @param[in] txbuf the pointer to the transmit buffer
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*
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* @notapi
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*/
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void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
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spi_lld_exchange( spip, n, txbuf, NULL);
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}
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/**
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* @brief Receives data from the SPI bus.
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* @details This asynchronous function starts a receive operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to receive
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* @param[out] rxbuf the pointer to the receive buffer
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*
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* @notapi
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*/
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void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
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spi_lld_exchange( spip, n, NULL, rxbuf);
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}
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/**
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* @brief Exchanges one frame using a polled wait.
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* @details This synchronous function exchanges one frame using a polled
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* synchronization method. This function is useful when exchanging
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* small amount of data on high speed channels, usually in this
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* situation is much more efficient just wait for completion using
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* polling than suspending the thread waiting for an interrupt.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] frame the data frame to send over the SPI bus
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* @return The received data frame from the SPI bus.
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*/
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uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
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spip->spi->TXCTRL |= SPI_TXCTRL_EOT;
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spip->spi->TXDAT = frame;
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while ((spip->spi->STAT & SPI_STAT_RXRDY) == 0)
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;
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return (uint16_t)spip->spi->RXDAT;
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}
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#endif /* HAL_USE_SPI */
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/** @} */
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@ -0,0 +1,285 @@
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC8xx/spi_lld.h
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* @brief LPC8xx low level SPI driver header.
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*
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* @addtogroup SPI
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* @{
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*/
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#ifndef _SPI_LLD_H_
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#define _SPI_LLD_H_
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#if HAL_USE_SPI || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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#define SPI_CFG_ENABLE (1<<0)
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#define SPI_CFG_MASTER (1<<2)
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#define SPI_CFG_LSBF (1<<3)
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#define SPI_CFG_CHPA (1<<4)
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#define SPI_CFG_CPOL (1<<5)
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#define SPI_CFG_LOOP (1<<7)
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#define SPI_CFG_SPOL (1<<8)
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#define SPI_DLY_PRE(n) (((n)&0x0f)<< 0)
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#define SPI_DLY_POST(n) (((n)&0x0f)<< 4)
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#define SPI_DLY_FRAME(n) (((n)&0x0f)<< 8)
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#define SPI_DLY_TFER(n) (((n)&0x0f)<<12)
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#define SPI_STAT_RXRDY (1<<0)
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#define SPI_STAT_TXRDY (1<<1)
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#define SPI_STAT_RXOV (1<<2)
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#define SPI_STAT_TXUR (1<<3)
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#define SPI_STAT_SSA (1<<4)
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#define SPI_STAT_SSD (1<<5)
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#define SPI_STAT_STALL (1<<6)
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#define SPI_STAT_EOT (1<<7)
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#define SPI_STAT_IDLE (1<<8)
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#define SPI_TXCTRL_TXSSELN (1<<16)
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#define SPI_TXCTRL_EOT (1<<20)
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#define SPI_TXCTRL_EOF (1<<21)
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#define SPI_TXCTRL_RXIGNORE (1<<22)
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#define SPI_TXCTRL_FLEN(n) (((n)-1)<<24)
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#define SPI_TXCTRL_FLEN_MASK (0x0f<<24)
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @brief SPI1 driver enable switch.
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* @details If set to @p TRUE the support for device SPI0 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(LPC8xx_SPI_USE_SPI0) || defined(__DOXYGEN__)
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#define LPC8xx_SPI_USE_SPI0 TRUE
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#endif
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/**
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* @brief SPI2 driver enable switch.
|
||||
* @details If set to @p TRUE the support for device SPI1 is included.
|
||||
* @note The default is @p TRUE.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_USE_SPI1) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_USE_SPI1 FALSE
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief SPI0 PCLK divider.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_SPI0CLKDIV) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_SPI0CLKDIV 1
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief SPI1 PCLK divider.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_SPI1CLKDIV) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_SPI1CLKDIV 1
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief SPI0 interrupt priority level setting.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_SPI0_IRQ_PRIORITY) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_SPI0_IRQ_PRIORITY 1
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief SPI1 interrupt priority level setting.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_SPI1_IRQ_PRIORITY) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_SPI1_IRQ_PRIORITY 1
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief Overflow error hook.
|
||||
* @details The default action is to stop the system.
|
||||
*/
|
||||
#if !defined(LPC8xx_SPI_ERROR_HOOK) || defined(__DOXYGEN__)
|
||||
#define LPC8xx_SPI_ERROR_HOOK(spip) chSysHalt()
|
||||
#endif
|
||||
|
||||
/*===========================================================================*/
|
||||
/* Derived constants and error checks. */
|
||||
/*===========================================================================*/
|
||||
|
||||
#if (LPC8xx_SPI_SPI0CLKDIV < 1) || (LPC8xx_SPI_SPI0CLKDIV > 255)
|
||||
#error "invalid LPC8xx_SPI_SSP0CLKDIV setting"
|
||||
#endif
|
||||
|
||||
#if (LPC8xx_SPI_SPI1CLKDIV < 1) || (LPC8xx_SPI_SPI1CLKDIV > 255)
|
||||
#error "invalid LPC8xx_SPI_SSP1CLKDIV setting"
|
||||
#endif
|
||||
|
||||
#if !LPC8xx_SPI_USE_SPI0 && !LPC8xx_SPI_USE_SPI1
|
||||
#error "SPI driver activated but no SPI peripheral assigned"
|
||||
#endif
|
||||
|
||||
/**
|
||||
* @brief SPI0 clock.
|
||||
*/
|
||||
#define LPC8xx_SPI_SPI0_PCLK \
|
||||
(LPC8xx_SYSCLK / LPC8xx_SPI_SPI0CLKDIV)
|
||||
|
||||
/**
|
||||
* @brief SPI1 clock.
|
||||
*/
|
||||
#define LPC8xx_SPI_SPI1_PCLK \
|
||||
(LPC8xx_SYSCLK / LPC8xx_SPI_SPI1CLKDIV)
|
||||
|
||||
/*===========================================================================*/
|
||||
/* Driver data structures and types. */
|
||||
/*===========================================================================*/
|
||||
|
||||
/**
|
||||
* @brief Type of a structure representing an SPI driver.
|
||||
*/
|
||||
typedef struct SPIDriver SPIDriver;
|
||||
|
||||
/**
|
||||
* @brief SPI notification callback type.
|
||||
*
|
||||
* @param[in] spip pointer to the @p SPIDriver object triggering the
|
||||
* callback
|
||||
*/
|
||||
typedef void (*spicallback_t)(SPIDriver *spip);
|
||||
|
||||
/**
|
||||
* @brief Driver configuration structure.
|
||||
*/
|
||||
typedef struct {
|
||||
/**
|
||||
* @brief Operation complete callback or @p NULL.
|
||||
*/
|
||||
spicallback_t end_cb;
|
||||
/* End of the mandatory fields.*/
|
||||
|
||||
/**
|
||||
* @brief SPI CFG initialization data.
|
||||
*/
|
||||
uint16_t cfg;
|
||||
/**
|
||||
* @brief SPI DLY initialization data.
|
||||
*/
|
||||
uint16_t dly;
|
||||
/**
|
||||
* @brief SPI TXCTRL initialization data.
|
||||
*/
|
||||
uint32_t txctrl;
|
||||
} SPIConfig;
|
||||
|
||||
/**
|
||||
* @brief Structure representing a SPI driver.
|
||||
*/
|
||||
struct SPIDriver {
|
||||
/**
|
||||
* @brief Driver state.
|
||||
*/
|
||||
spistate_t state;
|
||||
/**
|
||||
* @brief Current configuration data.
|
||||
*/
|
||||
const SPIConfig *config;
|
||||
#if SPI_USE_WAIT || defined(__DOXYGEN__)
|
||||
/**
|
||||
* @brief Waiting thread.
|
||||
*/
|
||||
Thread *thread;
|
||||
#endif /* SPI_USE_WAIT */
|
||||
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
|
||||
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
|
||||
/**
|
||||
* @brief Mutex protecting the bus.
|
||||
*/
|
||||
Mutex mutex;
|
||||
#elif CH_USE_SEMAPHORES
|
||||
Semaphore semaphore;
|
||||
#endif
|
||||
#endif /* SPI_USE_MUTUAL_EXCLUSION */
|
||||
#if defined(SPI_DRIVER_EXT_FIELDS)
|
||||
SPI_DRIVER_EXT_FIELDS
|
||||
#endif
|
||||
/* End of the mandatory fields.*/
|
||||
/**
|
||||
* @brief Pointer to the SPI registers block.
|
||||
*/
|
||||
LPC_SPI_TypeDef *spi;
|
||||
/**
|
||||
* @brief Number of words yet to be received.
|
||||
*/
|
||||
uint32_t rxcnt;
|
||||
/**
|
||||
* @brief Receive pointer or @p NULL.
|
||||
*/
|
||||
void *rxptr;
|
||||
/**
|
||||
* @brief Number of words yet to be transmitted.
|
||||
*/
|
||||
uint32_t txcnt;
|
||||
/**
|
||||
* @brief Transmit pointer or @p NULL.
|
||||
*/
|
||||
const void *txptr;
|
||||
};
|
||||
|
||||
/*===========================================================================*/
|
||||
/* Driver macros. */
|
||||
/*===========================================================================*/
|
||||
|
||||
/*===========================================================================*/
|
||||
/* External declarations. */
|
||||
/*===========================================================================*/
|
||||
|
||||
#if LPC8xx_SPI_USE_SPI0 && !defined(__DOXYGEN__)
|
||||
extern SPIDriver SPID1;
|
||||
#endif
|
||||
|
||||
#if LPC8xx_SPI_USE_SPI1 && !defined(__DOXYGEN__)
|
||||
extern SPIDriver SPID2;
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
void spi_lld_init(void);
|
||||
void spi_lld_start(SPIDriver *spip);
|
||||
void spi_lld_stop(SPIDriver *spip);
|
||||
void spi_lld_select(SPIDriver *spip);
|
||||
void spi_lld_unselect(SPIDriver *spip);
|
||||
void spi_lld_ignore(SPIDriver *spip, size_t n);
|
||||
void spi_lld_exchange(SPIDriver *spip, size_t n,
|
||||
const void *txbuf, void *rxbuf);
|
||||
void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
|
||||
void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
|
||||
uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* HAL_USE_SPI */
|
||||
|
||||
#endif /* _SPI_LLD_H_ */
|
||||
|
||||
/** @} */
|
||||
Loading…
Reference in New Issue